3401b2fff3
Let general purpose I2C/SMBus bus drivers add SPD to their class. Once this is done, we will be able to tell the eeprom driver to only probe for SPD EEPROMs and similar on these buses. Note that I took a conservative approach here, adding I2C_CLASS_SPD to many drivers that have no idea whether they can host SPD EEPROMs or not. This is to make sure that the eeprom driver doesn't stop probing buses where SPD EEPROMs or equivalent live. So, bus driver maintainers and users should feel free to remove the SPD class from drivers those buses never have SPD EEPROMs or they don't want the eeprom driver to bind to them. Likewise, feel free to add the SPD class to any bus driver I might have missed. Signed-off-by: Jean Delvare <khali@linux-fr.org>
199 lines
5.6 KiB
C
199 lines
5.6 KiB
C
/*
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* Copyright (C) 2004 Steven J. Hill
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* Copyright (C) 2001,2002,2003 Broadcom Corporation
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* Copyright (C) 1995-2000 Simon G. Vogl
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/i2c.h>
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#include <asm/io.h>
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#include <asm/sibyte/sb1250_regs.h>
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#include <asm/sibyte/sb1250_smbus.h>
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struct i2c_algo_sibyte_data {
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void *data; /* private data */
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int bus; /* which bus */
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void *reg_base; /* CSR base */
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};
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/* ----- global defines ----------------------------------------------- */
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#define SMB_CSR(a,r) ((long)(a->reg_base + r))
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static int smbus_xfer(struct i2c_adapter *i2c_adap, u16 addr,
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unsigned short flags, char read_write,
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u8 command, int size, union i2c_smbus_data * data)
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{
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struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
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int data_bytes = 0;
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int error;
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while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
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;
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switch (size) {
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case I2C_SMBUS_QUICK:
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csr_out32((V_SMB_ADDR(addr) |
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(read_write == I2C_SMBUS_READ ? M_SMB_QDATA : 0) |
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V_SMB_TT_QUICKCMD), SMB_CSR(adap, R_SMB_START));
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break;
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case I2C_SMBUS_BYTE:
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if (read_write == I2C_SMBUS_READ) {
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csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_RD1BYTE),
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SMB_CSR(adap, R_SMB_START));
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data_bytes = 1;
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} else {
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csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
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csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR1BYTE),
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SMB_CSR(adap, R_SMB_START));
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}
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break;
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case I2C_SMBUS_BYTE_DATA:
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csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
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if (read_write == I2C_SMBUS_READ) {
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csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD1BYTE),
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SMB_CSR(adap, R_SMB_START));
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data_bytes = 1;
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} else {
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csr_out32(V_SMB_LB(data->byte),
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SMB_CSR(adap, R_SMB_DATA));
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csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE),
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SMB_CSR(adap, R_SMB_START));
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}
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break;
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case I2C_SMBUS_WORD_DATA:
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csr_out32(V_SMB_CMD(command), SMB_CSR(adap, R_SMB_CMD));
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if (read_write == I2C_SMBUS_READ) {
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csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_CMD_RD2BYTE),
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SMB_CSR(adap, R_SMB_START));
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data_bytes = 2;
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} else {
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csr_out32(V_SMB_LB(data->word & 0xff),
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SMB_CSR(adap, R_SMB_DATA));
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csr_out32(V_SMB_MB(data->word >> 8),
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SMB_CSR(adap, R_SMB_DATA));
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csr_out32((V_SMB_ADDR(addr) | V_SMB_TT_WR2BYTE),
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SMB_CSR(adap, R_SMB_START));
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}
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break;
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default:
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return -1; /* XXXKW better error code? */
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}
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while (csr_in32(SMB_CSR(adap, R_SMB_STATUS)) & M_SMB_BUSY)
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;
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error = csr_in32(SMB_CSR(adap, R_SMB_STATUS));
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if (error & M_SMB_ERROR) {
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/* Clear error bit by writing a 1 */
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csr_out32(M_SMB_ERROR, SMB_CSR(adap, R_SMB_STATUS));
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return -1; /* XXXKW better error code? */
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}
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if (data_bytes == 1)
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data->byte = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xff;
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if (data_bytes == 2)
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data->word = csr_in32(SMB_CSR(adap, R_SMB_DATA)) & 0xffff;
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return 0;
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}
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static u32 bit_func(struct i2c_adapter *adap)
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{
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return (I2C_FUNC_SMBUS_QUICK | I2C_FUNC_SMBUS_BYTE |
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I2C_FUNC_SMBUS_BYTE_DATA | I2C_FUNC_SMBUS_WORD_DATA);
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}
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/* -----exported algorithm data: ------------------------------------- */
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static const struct i2c_algorithm i2c_sibyte_algo = {
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.smbus_xfer = smbus_xfer,
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.functionality = bit_func,
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};
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/*
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* registering functions to load algorithms at runtime
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*/
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static int __init i2c_sibyte_add_bus(struct i2c_adapter *i2c_adap, int speed)
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{
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struct i2c_algo_sibyte_data *adap = i2c_adap->algo_data;
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/* Register new adapter to i2c module... */
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i2c_adap->algo = &i2c_sibyte_algo;
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/* Set the requested frequency. */
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csr_out32(speed, SMB_CSR(adap,R_SMB_FREQ));
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csr_out32(0, SMB_CSR(adap,R_SMB_CONTROL));
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return i2c_add_adapter(i2c_adap);
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}
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static struct i2c_algo_sibyte_data sibyte_board_data[2] = {
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{ NULL, 0, (void *) (CKSEG1+A_SMB_BASE(0)) },
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{ NULL, 1, (void *) (CKSEG1+A_SMB_BASE(1)) }
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};
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static struct i2c_adapter sibyte_board_adapter[2] = {
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{
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.owner = THIS_MODULE,
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.id = I2C_HW_SIBYTE,
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.class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
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.algo = NULL,
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.algo_data = &sibyte_board_data[0],
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.name = "SiByte SMBus 0",
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},
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{
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.owner = THIS_MODULE,
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.id = I2C_HW_SIBYTE,
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.class = I2C_CLASS_HWMON | I2C_CLASS_SPD,
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.algo = NULL,
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.algo_data = &sibyte_board_data[1],
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.name = "SiByte SMBus 1",
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},
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};
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static int __init i2c_sibyte_init(void)
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{
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pr_info("i2c-sibyte: i2c SMBus adapter module for SiByte board\n");
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if (i2c_sibyte_add_bus(&sibyte_board_adapter[0], K_SMB_FREQ_100KHZ) < 0)
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return -ENODEV;
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if (i2c_sibyte_add_bus(&sibyte_board_adapter[1],
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K_SMB_FREQ_400KHZ) < 0) {
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i2c_del_adapter(&sibyte_board_adapter[0]);
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return -ENODEV;
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}
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return 0;
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}
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static void __exit i2c_sibyte_exit(void)
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{
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i2c_del_adapter(&sibyte_board_adapter[0]);
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i2c_del_adapter(&sibyte_board_adapter[1]);
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}
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module_init(i2c_sibyte_init);
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module_exit(i2c_sibyte_exit);
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MODULE_AUTHOR("Kip Walker (Broadcom Corp.), Steven J. Hill <sjhill@realitydiluted.com>");
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MODULE_DESCRIPTION("SMBus adapter routines for SiByte boards");
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MODULE_LICENSE("GPL");
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